RE: (ET) speed control

["Phil Trice" <pctrice purdue edu>]

Neil et al,
        I'll weigh in on this one. I have what someone described as a 'New 
Idea'
tractor. On this unit, the main traction motor runs all the time (constant
speed), and uses a clutch and three-speed transmission to control direction
& ground speed.
        This has the advantage of being very simple, but not very 
efficient. What I
would like (and have plans) to do is to replace the motor with a
shunt-wound, variable speed motor and electronic controller. My ultimate
goal is to make mowing more efficient by making it unnecessary to use the
transmission & clutch to start, stop, and change direction & speed.
Does this sound ambitious?


        -Phil Trice
        West Lafayette, IN




-----Original Message-----
From: owner-elec-trak cosmos phy tufts edu
[mailto:owner-elec-trak cosmos phy tufts edu]On Behalf Of Neil Dennis
Sent: Wednesday, January 09, 2002 4:03 PM
To: Elec-trak
Subject: (ET) speed control


Dunno, my JD90 has the constant speed motor and tranny, *lots* simpler.
It would be nice sometimes to have reverses without shifting but kinda
50 50 when you have to stop the motor then.  Lots more effeicient than
theating those big resistors on the GE, I never seem to run anything but
"high" anyway.

I just bought a whole box of assorted trip-o-lett meters, all sizes,
mostly microamp scales, if anyone is interested ask for size, I'll look
- they will be cheap.

wombat